This next step is quite an important one because now you can choose at what member count you want your milestone to be triggered at. The interval is the number of members between each milestone, and by default it is set to 100. This means that every 100 members, a milestone is triggered, such as 200, 300, 400, etc.
The milestone interval can be any number within reason as long as it is a multiple of 5. Conceivably the interval can be set to 5 or it can be set to 100,000. To set your interval, type the following command: